«OIL AND GAS GEOLOGY» № 4/2015

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CONTENTS

 

OIL AND GAS POTENTIAL PROSPECTS AND EXPLORATION RESULTS

 

Shuvaev A.O. Structure and oil and gas bearing capacity of the Neocomian clinoform complex within the limits of the Bolshekhetskaya depression

 

The paper is devoted to the evaluation of the oil and gas bearing capacity of the Neocomian
clinoform complex within the limits of the Bolshekhetskaya Depression. At the first stage sandy layers of the Achimovskaya strata were determined and delineated. After that the possibility of hydrocarbon accumulation in these deposits was estimated. At the final stage risks were analyzed. The application of complex methods of geological exploration (sequence-stratigraphic analysis, basin modeling, risk analysis) allows to increase the efficiency of geological exploration planning.

 

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Shikhaliyev Y.A., Kocharly Sh.S. Directions of exploration surveys on Mesozoic sediments of Azerbaijan

 

Despite more than half century history of conducted exploration surveys on Mesozoic sediments in Azerbaijan, totally the results are quite meager: 3 or 4 oil deposits with ultimate reserves about 5 million tons have been discovered on the category A+B+C1. Many researches consider the following reasons of negative results: failure in the development of initial criteria for part of brought forward analogies, non-compliance of step-by-step-approach of exploration works expressed in putting structures into drilling without sufficient geophysical study, lack of geological-economic
analysis of putting small-sized areas into drilling and resources C3. According to the results of new geological-geophysical surveys, directions of further exploration surveys on every districts of Azerbaijan are detailed. To enhance the reliability of drilling works, the increase in the volume of 2D and 3D seismic surveys is suggested.

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METHODS OF OIL AND GAS DEPOSITS PROSPECTING

 

Grunis E.B., Rostovshchikov V.B., Kolokolova I.L. Forecast and exploration methods for non-anticline oil deposits in the Silurian and Lower Devonian sediments of the Bolshezemelsky arch

 

The paper presents the substantiation for the forecast of the discovery of non-anticline oil deposits in the Silurian and Lower Devonian sediments of the Bolshezemelsky arch. The methods of anticline traps mapping are considered and the exploration directions for such traps are defined within the limits of the Bolshezemelsky arch.

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GEOPHYSICAL INVESTIGATIONS

 

Nikishin A.M., Startseva K.F. The example of volumetrical structure of shift zones according to 3D seismic data interpretation

 

The investigation of the shift zone dislocation with a break of continuity is an urgent problem of oil and gas geology as tectonic structures play an important role in the formation of fluid-dynamic systems. 3D seismic allows to investigate the structure of the discontinuous dislocations of the shift zones under the conditions of a real geological space. The article presents detailed geo-metrical characteristics of the dislocations of conjugate shift zones. The characteristics were obtained with the help of new 3D seismic data analysis. The regularities of the spatial location of feathering faults were determined and the empirical models of the basement shift – feathering fault relation were constructed.

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GEOCHEMICAL INVESTIGATIONS

 

Gavrilov V.P., Leonova E.A. Generation and accumulation hydrocarbon potential of the Changhong depression (Vietnam Northern Shelf)

 

In the paper the generation potential of oil and gas source suites of the Changhong Depression (Vietnam Northern Shelf) was analyzed, and the beginning of hydrocarbon emigration and oil window limits were substantiated. Reservoirs, seals and traps were characterized. Jointing was proved to be essential for the formation of reservoir storage volume. It was shown that anticline-like structures in the central part of the Changhong Depression have mud volcanic nature. The article presents practical guidelines for the further exploration work.

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HARD-TO-EXTRACT AND NON-TRADITIONAL HYDROCARBON SOURCES

 

Lebedko G.I. Khadumites of the Northern Caucasus

 

The article presents the development prospects of the oil and gas industry of the Northern Caucasus. The prospects are connected not only with the shelf of the southern seas, but also with the clayey strata of the depressions as oil potential of the Maykop series is high (including the Khadum and the Kumskaya suites). The analysis of the vertical zones of the heat and mass transfer (fluid flow) in addition to the structural factor is recommended as the forecast parameter at the prospecting and exploring stage. For the clayey reservoirs in the khadumites ultrasonic exposure is suggested instead of depression methods of the reservoir activation.

 

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Dakhnova M.V., Mozhegova S.V., Nazarova E.S., Paizanskaya I.L. Evaluation of reserves of shale oil using geochemical parameters

 

In the article it’s discussed one of the approaches to evaluation of geological reserves and resources of “shale oil” in sediments of the Domanik type based on use of geochemical data.
The Rock-Eval is shown to be the most effective geochemical method of identification of oil-saturated intervals in the section, determination of their thickness and quantitative estimation
of their oil content. For determination of the 3D distribution of oil-saturated bodies it’s proposed integration of the Rock-Eval method with investigations of oils and bitumen by one of the methods of reservoir geochemistry. The effectiveness of application of the geochemical methods is demonstrated in the particular case of the West Siberian Bazhenov Formation.

 

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Iskritskaya N.I., Makarevich V.N., Shchepochkina A.A. Main trends in the development of hard-to-extract oil reserves of the Russian Federation

 

Currently hard-to-extract reserves make virtually two thirds of all extractable reserves of the Russian Federation, and its part is constantly growing. So far there is no common approach to hard-to-extract reserves classification, there is a disagreement in terms and definitions. While the technologies are developing, the view of the criteria indices values is changing, and on the basement of these criteria the reserves are referred to hard-to-extract category. The actual data shows that the part of hard-to-extract reserves in output is significantly less compared to its part in reserves. The methods of stimulation and the ways of speeding-up the hard-to-extract reserves
development are given in the article.

 

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DISCUSSION

 

Nagevich P.P., Shein V.S. Universal grid of planetary faults and hydrocarbon deposits location

 

The paper presents the hypothesis that there is a universal grid of faults formed in the Archean-Proterozoic Era during the plum-tectonics manifestation. Afterwards the faults became more complicated due to the plate tectonics. As the result linear and diffusive jointing zones formed, which could be noticed in local and regional scale. Jointing zones contributed to the hydrocarbon accumulation. Universal (standard) directions of sublatitudinal and submeridianal planetary faults were determined, which can be noticed on any part of the Earth. The faults can act as a geotectonic indicator that increases the efficiency of deposit exploration. Jointing zones and referred to them deposits and promising areas for hydrocarbon accumulation were determined
for certain regions of Russia.